Method for preparing anode material of lithum ion battery by using solvent-nonsolvent

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, electrode heat treatment, active material electrodes, etc., can solve problems such as uneven grain size of products, low electrochemical activity, and difficult control of reactants, and achieve powder crystallization Good temperature, reduced lithium evaporation loss, reduced temperature and sintering time

Inactive Publication Date: 2003-07-23
张文魁 +4
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Problems solved by technology

Before the present invention was made, the preparation of lithium-ion battery electrode anode materials mainly used solid phase reaction method, molten salt impregnation method, sol-gel method, Pechini method, hot pressing synthesis method, hydrothermal synthesis method and co-precipitation method, etc., Among them, the solid-phase reaction method is the main industrial production method at present. The compound of lithium and cobalt, manganese or nickel is thoroughly ground and mixed repeatedly, and then roasted at high temperature to obtain the product. The operation process is simple, the raw material is easy to obtain, and the product crystal form is relatively Good, but the reaction time is long (tens of hours to several days), the temperature is high (800-1200°C), and temperature is the only controlling factor, it is relatively difficult to control the reactants, the grain size of the product is uneven, and the product is consistent Poor performance, low electrochemical activity

Method used

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Embodiment

[0019] Lithium hydroxide and cobalt nitrate were weighed at a ratio of Li / Co=1:1 (molar ratio), firstly mechanically alloyed and ball milled, the raw materials were thoroughly mixed, and then deionized water was added to dissolve to form a 1.0mol / L solution. During the dissolution process, the solution is heated to 60°C, and the solution is fully stirred by mechanical stirring. After the raw materials are fully dissolved, stop heating and stirring, and remove it for use.

[0020] Using toluene as a non-aqueous solvent, put the toluene into a container tank with a cooling device, and then slowly add the prepared raw material solution into the toluene solvent, so that the raw material forms a precipitate (precursor) in the toluene to separate out. During the precipitation process of the precursor, the solution is stirred mechanically, and at the same time, the toluene solution is cooled by cooling water to ensure that the crystallization temperature is maintained at 20-25°C. Aft...

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Abstract

First, with the proportioning materials being prepared, the mechanical ball milling method is utilized to mix the materials evenly. With the deionized water being added, the said admixture is stirredup to obtain the solution of the materials. The prepared solution is filled to the non-aqueous organic solvent slowly ty obtain the predecessor in fine crystal. With the predecessor being vacuum dried, the anode material of lithium ion battery is obtained by sintering the predecessor in 3-10 hours at 500-1200 deg.C. The invention features the low sintering temperature and time, the even granule (100nm-700nm) of the material and good electrochemistry performances.

Description

technical field [0001] The invention relates to a preparation method of a positive electrode material of a lithium ion battery. Background technique [0002] Lithium-ion batteries refer to secondary batteries in which lithium-ion intercalation compounds are positive and negative electrodes. Compared with traditional secondary batteries such as cadmium-nickel and nickel-metal hydride batteries, lithium-ion batteries have a high working voltage (up to 3.6-3.7V) , high volume and mass specific energy, no memory effect, small self-discharge, long cycle life and environmental friendliness, etc., which meet the development requirements of miniaturization, light weight and high energy for the rapid development of mobile communication and information technology Since Japan's Sony Corporation developed lithium-ion batteries in 1990, there has been an upsurge in research and industrialization of lithium-ion batteries worldwide, and it has developed rapidly as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/02H01M4/02H01M4/04H01M4/131H01M4/48H01M4/50H01M4/505H01M4/52H01M4/525
CPCH01M4/505Y02E60/122H01M4/525H01M4/0471H01M2004/021H01M4/131Y02E60/10
Inventor 张文魁黄德欢涂江平杨慕杰李扬
Owner 张文魁
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